In some modern versions of Nahuatl, such as Hueyapan, as I recall, intervocalic -k- becomes -g-, which might help to explain the "g", but the "zt" of "coztic" to "s", I don't know. -- John F. Schwaller President, SUNY Potsdam 44 Pierrepont Ave. Potsdam, NY 13676 schwallr at potsdam.edu